Improvement in truing grindstones



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CHARLES E. WILSON, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 92,242, dated July 6, 1869; antedated .Tune 19, 1869.y

IMPRQVEMBNT IN Tamise GaINDsToNns.

The Schedule referred to' in thse Letters Patient and making part of theSame.

ful Improvements in Truing Grindstones; anddo hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and-to the letters of referencemarked thereon.

In the annexed drawings, making part of this specification- A Arepresents a grindstone-frame, whichis madein the usual way, but largeenough to hold two stones.

B B represent the grindstones. v

These stones are provided with suitable' shaft-s, which have theirbearingsin the movable boxes O O.'

These boxes O G rest upon the upper edges-of the flame A, and slide uponit, being moved by means of the screwsEE.` 4 s These screws pass throughthe stationary block D D, which are secured upon the upper edges of theframe.

Upon the outer ends of the stone-shafts, on o ne side of the frame, aresecured the gear-wheels I I. y

Between the wheels I are situated two gear-wheels H H, which gear intoeach other, and then into the wheels I. i

l'Ihese wheels H. are placed upon short shafts G, which said shafts aresecured liruily to a sliding T- sliaped frame L.

The leg or lower end of this frame L is slotted, and4 through this slotpass the two setfscrews 'm m. This frame is adjusted vertically, andsecured in place by means ofthe set-screws m on.

, Upon the outer end of one of the shafts, G, is

The object of' this arrangement of gear-wheels and sliding bearings GO,is to so adjust the two grindstories iu the frame,v that theirperipheries will touch each other when desirable for mutually levellingtheirv When grindstones are much used in machine-shops 'y for sharpeningup tools, their faces will in a short time become uneven, and in orderto level their faces, they are made to run with these faces together, ashas been stated. As the stones wear and becomesmaller, the frame L isdropped, and the bearings C C are moved inward, toward each other, justsuiiiciently always to keep the peripheries of the stones together.

- 'lhe gear-wheels are so' arranged that, they will always gear togetherproperly when the stones are touching. f 'lhe stones are driven bya bandwhich passes over the pulley J. y y

When it is desirable to stop the motionv of the stones, the band isshifted to the loose pulley K. y

',Ihe gear-wheels are made of such sizes, ofcourse, as will run thegrindstones at 'unequal speed.

Having thus fully described -rny invention, What I claim as new, anddesire to secure by Leiv The arrangement of the grindstonesB B, in sucha manner upon the frame A, that their peripheries will touch, so thatwhen they are revolved at unequal speed, they will mutually level eachothers faces, the

same being adjusted substantially as herein set forth.

In testimony that I claim the foregoing, I have hereunto set my hand,this 14th day of October, 1867. CHARLES E. WILSON.

Vtnesses:

C. M. ALEXANDER, J. M. MASON.

